Scroll really slow on commit view

Scrolling is really slow on a commit view even with small diff. My Firefox JS log give me this :

mutating the [[Prototype]] of an object will cause your code to run very slowly; instead create the object with the correct initial [[Prototype]] value using Object.create application-5ec1aeb4604cbfbeff836f956308b0ed.js:32:28481

This refer to this line :

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